Porosity evolution of VP-DVB/MCM-41 nanocomposite

The porous structure of nanostructured vinylpyrrolidone-divinylbenzene (VP-DVB)/MCM-41 composite was characterized using N2 adsorption at 77 K and positronium annihilation lifetime spectroscopy (PALS), atomic force microscopy (AFM) and Raman spectroscopy. Positron annihilation lifetime spectra were measured during outgassing procedure. The voids of differentiated dimensions were detected in the composite material. The number of free volumes and their dimensions depend on the degree of evacuation of volatile components from the samples.

Evolution of mean diameters and relative volume of free spaces observed by Positron Annihilation Lifetime Spectroscopy (PALS) in PVP-DVB/MCM-41 composite during outgassing for (a) 13 h, (b) 40 h, (c) 95 h, (d) 230 h.Figure optionsDownload high-quality image (42 K)Download as PowerPoint slide